Kitchener Stitch is a great technique that comes in handy for grafting armholes, and when you want to create the look of an invisible seam. Follow these 5 steps to get started! http://www.creativeknittingmagazine.com/blog/?p=5316
How to Join in the Round Invisibly To join in the round invisibly, cast on one more stitch than your pattern calls for. Then, when you’re ready to join in the round, slip this extra stitch to the left needle. Using the working yarn and the yarn tail held together, knit the first two stitches together. Now drop the tail and knit as you normally would.
Have you heard of a Magic Ball? It’s a ball of yarn that changes colors and textures as you work. It’s something offered by a number of artisan yarn makers… but it’s also something you can make yourself with your leftover yarn!